Charts not showing up in IE

Charts not showing up in IE

I have a requirement of generating dynamic line charts in my application done in GWT. I have successfully implemented it and it works great on safari, firefox and of course, GWT hosted mode. However, in IE (both 7 & 8), it does not work. It does bring up a flash placeholder but does not display anything.

It would be great if someone could help me with this - else I will have to start looking at building charts from the scratch.

GWT 1.5.3
GWT Ext 2.0.5
Adobe Flash 10
IE 7 & 8

Note: I do see the charts getting rendered if I include the chart panel in Viewport [new Viewport(panel)], but that doesn't solve my purpose as I want the charts to show inside another panel in my application.